Materialization in progress. This is the placeholder Pages deployment
that proves the chain nexus.techflouu.com →
nexus-chat-ui.pages.dev works end-to-end and unlocks TLS.
The real chat UI lands in P16.1.5. Worker API for
/api/<instance>/* lands in P16.1.2 – P16.1.4.
Refs: nexus/specs/phase16_milestones.md · P16.1.1